Section 1.8 Mixed Applications and Computing Mean 69 Computing a Mean (Average) Ashley took 6 tests in Chemistry. Find her mean (average) score. 89, 91, 72, 86, 94, 96 Solution: 89 91 72 86 94 96 Add the values in the list first. Divide. Average score 528 6 Ashley’s mean (average) score is 88. 89 91 72 86 94 96 6 Section 1.8 Practice Exercises Study Skills Exercise Check yourself. Yes No Did you have sufficient time to study for the test on this chapter? If not, what could you have done to create more time for studying? Yes No Did you work all the assigned homework problems in this chapter? Yes No If you encountered difficulty in this chapter, did you see your instructor or tutor for help? Yes No Have you taken advantage of the textbook supplements such as the Student Solution Manual? Vocabulary and Key Concepts 1. The _______________ or average of a set of numbers is found by taking the sum of the values and then dividing by the number of values. 88 6528 48 48 48 0 88 6 Example 4 Answer 4. 28 years TIP: The division bar in is also a grouping symbol and implies parentheses: 189 91 72 86 94 962 6 Skill Practice 4. The ages (in years) of 5 students in an algebra class are given here. Find the mean age. 22, 18, 22, 32, 46
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